/**
* Add ON DUPLICATE KEY UPDATE to an INSERT query.
*
* @param mixed $column Column name, array(column, ...) or array('column' => expression, ...)
* @param mixed $expression Expression or value
* @param int $flags Query::SET_VALUE, Query::SET_EXPRESSION (default) + Query::REPLACE, Query::PREPEND or Query::APPEND (default) + Query::BACKQUOTE_%
* @return Query $this
*/
public function onDuplicateKeyUpdate($column = true, $expression = null, $flags = 0)
{
if (is_array($column)) {
foreach ($column as $key => &$val) {
if (is_int($key)) {
$val = QuerySplitter::backquote($val, $flags & ~self::_BACKQUOTE_OPTIONS | self::BACKQUOTE_STRICT);
$val .= " = VALUES({$val})";
} else {
$val = QuerySplitter::backquote($key, $flags & ~self::_BACKQUOTE_OPTIONS | self::BACKQUOTE_STRICT) . ' = ' . ($flags & self::SET_VALUE ? QuerySplitter::quote($val) : QuerySplitter::backquote($val, $flags));
}
}
$column = join(', ', $column);
} elseif ($column !== true) {
$column = QuerySplitter::backquote($column, $flags & ~self::_BACKQUOTE_OPTIONS | self::BACKQUOTE_STRICT);
if (!isset($expression)) {
$column .= " = VALUES({$column})";
} elseif ($flags & self::SET_VALUE) {
$column .= ' = ' . QuerySplitter::quote($value, 'DEFAULT');
} else {
$column .= ' = ' . QuerySplitter::mapIdentifiers($value, $flags);
}
}
$this->setPart('on duplicate key update', $column, $flags);
return $this;
}